from The American Heritage® Dictionary of the English Language, 4th Edition

adj. Reluctant through fear of humiliation or shame: ashamed to ask for help.

from Wiktionary, Creative Commons Attribution/Share-Alike License

adj. Feeling shame or guilt.

v. Simple past tense and past participle of ashame.

from the GNU version of the Collaborative International Dictionary of English

adj. Affected by shame; abashed or confused by guilt, or a conviction or consciousness of some wrong action or impropriety.

from The Century Dictionary and Cyclopedia

Affected or touched by shame; abashed or confused by guilt or a conviction of some wrong action, indecorous conduct, or other impropriety: hardly used attributively: followed by of, or by a dependent clause with that.

Reluctant through fear of shame: followed by an infinitive: as, I am ashamed to offer it, it is so little.

The news media has the maturity level of a spoiled adolescent – you know the type of kid that is alway calling someone names and making fun and is deep down in ashamed of themselves but just can't grow up.

Well neither party said the word ashamed, but she did said that a group vacation was not an option as homeland locals would be joining, and while I am welcome, my brother is not for those same locals would gossip.

The following instance is known to _The Christian_ as true, and to a remarkable degree indicates how thoroughly God knows our minutest needs, and how effectively He makes those who ever reproach his name ashamed of their unbelief.

Another reason why they must now be ashamed is because in the day of their prosperity they had looked with so much disdain upon their neighbours: Thy sister Sodom was not mentioned by thee in the day of they pride, v. 56.

I'm not so sure of the power of this word. There are varying levels of being ashamed. There is the shame of a child, and shame of a man, which are two completely different things. Obviously, shame is a much deeper emotion than something simple like embarrassment, but the expression"you should be ashamed of yourself" doesn't carry with it any gravitas.

One of the more powerful words in the English language. I remember Robert Bly reading this Alden Nolan poem, pausing, and remarking on the use of the word ashamed.

Then there's the Sufjan Stevens song Romulus, in which he sings, "I was ashamed, I was ashamed of her." The narrator is talking about his mother and when he sings "of her," he can't muster any more than a whisper.